:root{--color-bg: #f5f5f1;--color-surface: #ffffff;--color-ink: #171a1f;--color-ink-soft: #5b6472;--color-ink-faint: #8a92a0;--color-border: #e2e3dc;--color-accent: #2a5c9a;--color-accent-soft: #e9f0f8;--color-margin-rule: #a8481f;--color-wiki: #1f7a6c;--color-wiki-soft: #e6f2f0;--color-arxiv: #a8691f;--color-arxiv-soft: #f6eee1;--color-danger: #b3432e;--font-display: "Source Serif 4", Georgia, "Times New Roman", serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;--content-width: 760px;--radius: 6px}*{box-sizing:border-box}html{-webkit-font-smoothing:antialiased}body{margin:0;background:var(--color-bg);color:var(--color-ink);font-family:var(--font-body);line-height:1.5}button,input{font-family:inherit}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.page{max-width:var(--content-width);margin:0 auto;padding:48px 24px 96px}.site-header{border-bottom:1px solid var(--color-border);padding-bottom:20px;margin-bottom:40px}.site-header__title{font-family:var(--font-display);font-size:2rem;font-weight:700;margin:0 0 6px;letter-spacing:-.01em}.site-header__tagline{color:var(--color-ink-soft);font-size:.95rem;margin:0}.search-form{display:flex;gap:10px;margin-bottom:36px}.search-form__input{flex:1;padding:13px 16px;font-size:1rem;border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);color:var(--color-ink)}.search-form__input::placeholder{color:var(--color-ink-faint)}.search-form__submit{padding:13px 22px;font-size:.95rem;font-weight:600;border:none;border-radius:var(--radius);background:var(--color-ink);color:var(--color-bg);cursor:pointer;transition:background .15s ease;white-space:nowrap}.search-form__submit:hover:not(:disabled){background:var(--color-accent)}.search-form__submit:disabled{opacity:.5;cursor:not-allowed}.eyebrow{font-family:var(--font-mono);font-size:.7rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--color-ink-faint);margin:0 0 10px}.answer-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:28px 28px 24px 26px;margin-bottom:40px;border-left:3px solid var(--color-margin-rule)}.answer-card__query{font-family:var(--font-display);font-size:1.4rem;font-weight:600;margin:0 0 16px;line-height:1.3}.answer-card__answer{font-family:var(--font-display);font-size:1.05rem;line-height:1.7;color:var(--color-ink);white-space:pre-wrap;margin:0 0 24px}.answer-card__sources{border-top:1px solid var(--color-border);padding-top:16px;display:flex;flex-direction:column;gap:8px}.source-chip{display:flex;align-items:baseline;gap:10px;font-size:.88rem;text-decoration:none;color:var(--color-ink)}.source-chip:hover .source-chip__title{color:var(--color-accent)}.source-chip__type{font-family:var(--font-mono);font-size:.68rem;font-weight:500;letter-spacing:.05em;text-transform:uppercase;padding:2px 7px;border-radius:3px;flex-shrink:0}.source-chip__type--wikipedia{background:var(--color-wiki-soft);color:var(--color-wiki)}.source-chip__type--arxiv{background:var(--color-arxiv-soft);color:var(--color-arxiv)}.source-chip__title{color:var(--color-ink-soft);transition:color .15s ease}.state-message{font-size:.95rem;color:var(--color-ink-soft);padding:20px 0}.state-message--error{color:var(--color-danger)}.history-section__header{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}.history-list{display:flex;flex-direction:column;border-top:1px solid var(--color-border)}.history-row{display:flex;align-items:center;gap:14px;padding:14px 4px;border-bottom:1px solid var(--color-border);background:transparent;border-left:none;border-right:none;border-top:none;cursor:pointer;text-align:left;width:100%}.history-row:hover{background:var(--color-accent-soft)}.history-row__query{flex:1;font-size:.92rem;color:var(--color-ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-row__date{font-family:var(--font-mono);font-size:.72rem;color:var(--color-ink-faint);flex-shrink:0}.history-row__actions{display:flex;align-items:center;gap:4px;flex-shrink:0}.icon-button{border:none;background:transparent;cursor:pointer;font-size:1rem;padding:6px;border-radius:4px;line-height:1;color:var(--color-ink-faint);transition:color .15s ease,background .15s ease}.icon-button:hover{background:var(--color-border)}.icon-button--favorite[data-active=true]{color:var(--color-arxiv)}.icon-button--delete:hover{color:var(--color-danger)}